Emma Watson & Jaime King: Taylor & Lily Sandwich!

The 21-year-old Harry Potter cutie and 32-year-old Hart of Dixie beauty chatted up Abduction co-stars — and rumored couple — Taylor Lautner and Lily Collins (they shared an intimate dinner with friends after the ceremony and before the party).

“Emma talked about what it’s been like shooting The Perks of Being a Wallflower in Pittsburgh since she’s been there for a few weeks,” a spywitness tells JustJared.com. “She said it’s going to be really sad when the movie wraps because she loves everyone she’s working with. Everyone was also talking about where the best places in Pittsburgh were.”

Adds the source, “Emma added that she’s going back to school this fall as a junior. She’s definitely intent on finishing her college education!” (UPDATE: She probably be returning to Brown University.)

Cameron Diaz was also seen arriving and holding hands with on-again boyfriend, Yankees slugger Alex Rodriguez. Spider-Man‘s Andrew Garfield shared a few laughs with Twilight couple Robert Pattinson and Kristen Stewart, who dressed down in a ripped t-shirt, jeans, and sneakers. Rob had co-presented Reese Witherspoon with the MTV Generation Award earlier in the evening. He shared that he wrote what he had to say down on cue cards on the car ride over to the ceremony but joked that it didn’t help “because [he] messed up all of the jokes anyway.”